I had a rough night of trying to figure this out.
I was trying to switch back to Windows, but upon switching back I was prompted with bitlocker. It was accompanied with "Secure Boot Policy has unexpectedly changed." I messed with my BIOS settings until I could get it to work. I then arrived at a "Dell SupportAssist Recovery" screen for a while.
Eventually, switching from ACHI to RAID ON did it. I successfully was able to get back to Windows.
However, Grub now did not show up nor did Ubuntu show up in the boot menu. In an attempt to fix this, I did "bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi" in CMD. After doing this and rebooting my computer, I returned to the "Dell SupportAssist Recovery" screen.
After some more tinkering in the BIOS, adding shimx64.efi to the boot fixed it. My grub showed up and I can now get back into Ubuntu.
I just ran boot-repair on Ubuntu to see if that would fix Windows Boot, but it didn't. "Repair Windows boot files" is greyed out.
I am now terrified to mess with anymore settings in the BIOS so now I just wan't some advice. How can I get back into windows?
Edit: Boot-repair output as requested http://paste.ubuntu.com/p/zp3DqWzjZn/
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